The representatives of the genus Cercyon Leach occurring in the Greater Antilles are reviewed. Ten species are recorded, of which five are described here as new: C.
gimmeli
sp. n. (Dominican Republic), C.
armatipenis
sp. n. (Dominican Republic), C.
taino
sp. n. (Dominican Republic), C.
sklodowskae
sp. n. (Jamaica) and C.
spiniventris
sp. n. (Dominican Republic). Diagnoses and detailed distributional data are also provided for C.
floridanus Horn, 1890 (distributed in southeastern United States of America and Cayman Islands), C.
insularis Chevrolat, 1863 (endemic to the Antilles) C.
praetextatus (Say, 1825) (widely distributed in the New World incl. Greater Antilles), C.
quisquilius (Linnaeus, 1761) (an adventive species of Paleartic origin) and C.
nigriceps (Marshall, 1802) (an adventive species probably of Oriental origin). Cercyon
armatipenis, C.
gimmeli, C.
taino form a group of closely related species only distinguishable by male genitalia and DNA sequences. A key to the Great Antillean Cercyon is provided and important diagnostic characters are illustrated. The larvae of C.
insularis and C.
taino were associated with adults using COI barcode sequences, illustrated and diagnosed. Full occurrence data, additional images and COI barcode sequences were submitted to open access on-line depositories in an effort to provide access to complete data.
The representatives of the genus Oosternum Sharp, 1882 occurring in the West Indies are revised. Ten species are recorded, of which seven are here described as new: Oosternum andersoni sp.
The species of the genus Copelatus Erichson, 1832 occurring in the Dominican Republic are reviewed. Five species are recorded, with recent collecting data provided for four of them. Copelatus martini sp. nov., a member of the consors species group, is described and illustrated. It is compared to the apparently similar species C. guadelupensis Legros, 1948 based on morphological characters and on partial sequences of the CO1 gene. Interesting cases of intraspecific variability in the number of elytral dorsal striae in C. martini sp. nov. and C. vitraci are discussed in the light of the traditional taxo-nomic importance of this character for species group delimitation in Copelatus. Copelatus caelatipennis Aubé, 1838 and C. vitraci Legros, 1948 are recorded for the first time from the Dominican Republic (and therefore also from Hispaniola Island). The remaining species are C. posticatus (Fabricius, 1801), and C. insolitus Chevrolat, 1863 (for the latter, pre-sence in Hispaniola is doubtful and requires confirmation). Finally, C. guadelupensis is recorded from Puerto Rico for the first time, and a checklist of the Copelatus species of the Antilles is appended.
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